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'` � � ' �. ' � . . . � <br /> ,- ' Bonestroo z335 West Highw�y 3G • St, P�ul, MN 55113 . • �, <br /> �' �� Rosene OfFice:651-636-4G00.• F�x: 651-636-1311 , � • � . � • <br /> �s.. � - . _ . <br /> � � Anderlil< & www.honestroo.com ' • <br /> Associ�tes � � . . . � . � � ����/l,���, . <br /> Engineers&Architects . � AU� ' ' <br /> . � � � � z006 <br /> . . . . IT�,a�. �RoN . <br /> August 18, 2006 � � . � � p <br /> Mr.Mike Gaffron � � � � <br /> Planning Direcfor � � � � . <br /> . City of Orono � <br /> Post Office Box 66 . � . � . ' . <br /> Crystal Bay,MN 55323 . . . � • <br /> Re: 875 Wayzata Boulevard—Orono Villas • ' " . <br /> File No. OOOI39-06000-1 ' . � <br /> Plat No. 06-:i225 � � � � <br /> Dear Mike: ' - � <br /> We have reviewed the preliminary plans for the Orono Villas,located at 875 Wayzata Boulevard. The � <br /> �lans include constructing 9 townllouse units, along with associated grading and utilities. We have the <br /> following preliminary comments with regards to engineering matters: • <br /> � Grading/Drainage/Wetlands �. _ . � . � <br /> � �• � Engineered design and details should be provided for.,the proposed retaining wall along the abcess <br /> . �� � road_as it is over.4:�feet in lieight,. . � � � . • =. . <br /> • The.grading pTan shows numerous retaining walls in the area of the proposed townhomes. �Some � <br /> ' of these.walls appear to�cross�lot Iines, and some are greater than�4 feet in height. The applicant . . <br /> should proyide engineered design and�details for all wall�s over four feet in height, as well as a <br /> . staging plan showing how the ivalls will be constructed. � � . � � . <br /> o It appears the proposed grading along the north side of the site will impact the existing horse trail. � <br /> Plans should be submitted to.DNR for review and approval for this work. � � � <br /> � Plans should be submitted to the Minnehalia Creek Watershed Disirict for review and approval. � <br /> . � • See attached comrrients from.Lance Hoff regarding drainage� � <br /> • See attached comnnents from Jennifer Hildebrand regarding erosion control. � . <br /> Utilities . � � <br /> • Plans should include plan and profile views for all proposed sanitary and watermain. In addition, <br /> all utiliiy crossings should be identified and insulation should be used wlien vertical separation is <br /> less than 2 feet. � � ' <br /> s A detailed lift station design should be submitted for review and approval. . � <br /> • The proposed 4" forcemain serving Lot 1 appears to be excessive in size. Applicant should <br /> determine pipe size necessary for service to lot and revise plan accordingly. <br /> • The City of Orono will not be responsible for the ownership or mainteilance of either the <br /> proposed 4" forcemain from the proposed sanitary.sewer gravity manhole to Lot 1, or the <br /> proposed grinder pump for Lot 1. • . �. , • <br /> m The.proposed sewer and water services to Lot 4 encroach onto Lot�3. A�propriate easements <br /> should be provided, or.the services reali�ied, , ' <br /> • In order to allow for the minimum 2% slope required on all sanitary services, and to provide <br /> adequate vertical clearance between the service�nd low floor elevation, we recommend lowering <br /> the sanitary sewer in the areas of the services to Lots 3, 7, 8, and 9. <br /> • • The proposed 8" watermain should be e,ctended southeasterly to a point near the driveway that <br /> services Lot 1, a distance of approximafiely 175 feet. • <br /> St. I'aul, St. Cloud, Rochester, MN ° Milwaul<ee, WI ° Chicago, IL <br />